I could loco you could loco she could loco we could loco you could loco they could loco
V-ing form
I could be locoing you could be locoing she could be locoing we could be locoing you could be locoing they could be locoing
Perfect
I could have locoed you could have locoed she could have locoed we could have locoed you could have locoed they could have locoed
V-ing perfect
I could have been locoing you could have been locoing she could have been locoing we could have been locoing you could have been locoing they could have been locoing
Negation
Simple form
I couldn't loco you couldn't loco she couldn't loco we couldn't loco you couldn't loco they couldn't loco
V-ing form
I couldn't be locoing you couldn't be locoing she couldn't be locoing we couldn't be locoing you couldn't be locoing they couldn't be locoing
Perfect
I couldn't have locoed you couldn't have locoed she couldn't have locoed we couldn't have locoed you couldn't have locoed they couldn't have locoed
V-ing perfect
I couldn't have been locoing you couldn't have been locoing she couldn't have been locoing we couldn't have been locoing you couldn't have been locoing they couldn't have been locoing
Interrogative form
Simple form
could I loco? could you loco? could she loco? could we loco? could you loco? could they loco?
V-ing form
could I be locoing? could you be locoing? could she be locoing? could we be locoing? could you be locoing? could they be locoing?
Perfect
could I have locoed? could you have locoed? could she have locoed? could we have locoed? could you have locoed? could they have locoed?
V-ing perfect
could I have been locoing? could you have been locoing? could she have been locoing? could we have been locoing? could you have been locoing? could they have been locoing?
Interro-negative form
Simple form
couldn't I loco? couldn't you loco? couldn't she loco? couldn't we loco? couldn't you loco? couldn't they loco?
V-ing form
couldn't I be locoing? couldn't you be locoing? couldn't she be locoing? couldn't we be locoing? couldn't you be locoing? couldn't they be locoing?
Perfect
couldn't I have locoed? couldn't you have locoed? couldn't she have locoed? couldn't we have locoed? couldn't you have locoed? couldn't they have locoed?
V-ing perfect
couldn't I have been locoing? couldn't you have been locoing? couldn't she have been locoing? couldn't we have been locoing? couldn't you have been locoing? couldn't they have been locoing?